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Faraday generator for your bicycle led light Answered

I'm looking for a way to make a Faraday generator of some sort to put on my bikes rear wheel to power my led lights( a 56LED 3-1.5v AA's and 26LED 3-1.5v AAA's. I found something close that may work with some design changes. I found a magnet site with a magnet that could work with the wheel. I would mount it to the rim itself and put the copper coil attached to the bike. The problem is winding the coil of copper wire, gauge and what type of direction to make it. And the possible use of ultra capacitors or a built in charging system for the batteries. I would need a minimum voltage of 9 volts for the lights to run. The way the example light works is with a fly wheel and the bike's rim would take that place. The design is pretty simple and should work fine. The hub is 1.5" diameter and .5" deep with room across for the bundle of wound wires. Just looking for input and if anyone has thought of this before. Thanks.

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killerjackalope
killerjackalope

12 years ago

These are pretty funky little things but it may be easier just to take a motor to use a generator and power it off the wheel, also this arrangement would create an AC current, so making double set of led's in parallel and pointing opposite polarities would yield extra light...

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mpramse
mpramse

Reply 12 years ago

My goal is to try to make a frictionless system. I have considered the motor idea too. I am new to this type of thing so thanks for the advice.

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killerjackalope
killerjackalope

Reply 12 years ago

Well this is very similar to how the motor works but rearranged, as an improvement to get more power, attach magnets to all the spokes of the rim, at a certain distance, then mount the coils on the lower rear fork, giving you more power to use... That would also eliminate any mechanical friction, though the magnetic forces that convert kinetic to electrical energy are still at work...

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mpramse
mpramse

Reply 12 years ago

Thats what i thought about the motor. Thats how i planned on mounting the generator. I planned on using this magnet attacted to the rim itself on the lower left side.

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killerjackalope
killerjackalope

Reply 12 years ago

Ah right I thought you wanted to make it work from the hub, you could generate a good amount of electricity with some big coils and a magnet on each spoke... You'd need to have a voltage regulator of some description to keep the LED's from being trashed...

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mpramse
mpramse

Reply 12 years ago

How would i go about doing something like that, and is the current output in AC or DC and how to convert it to DC.

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killerjackalope
killerjackalope

Reply 12 years ago

Best bet is a full wave rectifier bridge... A simple device made of diodes, however if you're going direct to leds it might be easy to make the bridge from them and use a few more as a load...

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mpramse
mpramse

Reply 12 years ago

do you have a schematic and part #'s for that. and how about the use of ultra capacitors to use when the bike is stopped.

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killerjackalope
killerjackalope

Reply 12 years ago

How about a battery instead, hrrm, you'd need rectifying unless you can output a DC current which is why a DC motor is so commonly used in these, which eats into your max output voltage, doing a few tests to see what kind of voltage you can actually get from the described arrangements would be the way to tell, then add diodes, to the battery then a switch between battery and light, that way you can charge as you go but have the lights all the time... If you get an efficient system you could have a regulator and power take off to charge a phone or run a little amp...

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mpramse
mpramse

12 years ago

Updated with pics of bike and dimensions of the areas planed on installing the device.